1bad7

what tire manufacturer makes tires in 245/35/18 and 285/30/18. the lowest i could find were 245/40/18 and 285/35/18. will these be just as good?

Johnny

Pirelli does...P-zero asyo's..or something...
I think Michelin Pilot top of the lines...also

JoeD

nah...the biggest the Davins come in are 20". 20s on an S-class actually look small. you gotta drop an S-class on 23" Lowenhart LD-1s!

er...sorry to get so off topic

ibad7, Pirelli makes tires in those sizes.

Johnny

My neighbor has 19's on his E320...they look plenty big...23's on a S-class...too big. I'm seen them at streetwize...

1FAST7

What tires would work best on street?

1FAST7

SleepR1

For what application? Road? Track? Both?

For the day-to-day grind down bumpy roads, 9 x 16s with 245/45-16 would be a great setup. You get plenty of sidewall height for ride smoothness, and plenty of width for the times you want to carve up the country roads during those early Sunday morning "Banzai Runs"

The problem comes with trying to find 9 x 16s. There is no wheel maker that casts 9 x 16s for all 4 wheel positions. You'll need to go custom like Complete Custom Wheels (CCW). For 9-inch wide wheels to fit up front, go with a 7-inch backspace, 2-inch (50.8 mm) offset, 3-inch front space (assuming an overall rimwidth of 10 inches).

Of course there's nothing wrong with the stock sized wheels and tires. Just go for a lower offset to increase the track width, for example 8 x 16s with 38 mm offset for more cornering power during the "Banzai" runs

For the track--I'd go with 10 x 18 CCWs with 275/35-18 Hoosier R3S03. As everyone has posted, you need 2.5-inch coil springs for this to work. The 275/35-18 Hoosier R3S03 tire has 0.35-inch taller sidewalls than the 285/30-18, thus affording a more graceful break-away (progressive drifting) when at the Hoosier's absolute limit of adhesion. With ride-height adjustable coilovers, the slightly taller 275/35-18 shouldn't present any clearance issues.

For wheels/tires that can do both road and track, I'd go with 9.5 x 17s all around with 255/40-17 Bridgestone Potenza S-03 OR Pirelli P-Zero Asimmetricos. This wheel size will be a custom fitment necessitating 2.5-inch coil springs to make clearance for a 9.5-inch wide wheel up front. Wheel specs for a 9.5-inch width to fit up front would be--7.5-inch backspace, 3-inch frontspace, and 2.25-inch (57.2 mm) offset (assuming the wheel's overall width is 10.5 inches).

The 255/40-17 tire size is the same overall diameter as the stock 225/50-16 tire and should present no clearance issues if the wheel specs are correctly followed. The 255 mm nominal section width tire will expand to ~10.6 inches when mounted on 9.5-inch wide wheels. This will provide plenty of contact patch for both road and track applications.

If you have the stock 4-inch outer diameter springs, then a reasonable setup for both road and track would be 9 x 17s in 45 mm offset all around with 245/40-17 (Bridgestones or Pirellis). The 245/40 is slightly shorter in overall diameter and allows more clearnce away from the fender lips.

I'm partial to Pirelli P-Zero Asimmetricos for both road and track applications. They give decent ride quality for the boring daily grind; and on the road racing circuit the P-Zero Asimmetrics (worn or shaved to 5/32nds tread depth) are as good as Yokohama A032R, Toyo RA-1, or Kumho Victoracer V700 R-compound tires--the upshot is that the Pirellis will last up to 10,000 miles of road and track use!

Good luck!

Let us know what you end up with

1FAST7

So what would be the best tire for street that are 245/35 and 285/30?

1FAST7

HedgeHog

U really have no choice in tire brand for that sizing combo (245/35-18 F & 285/30-18 R). Pirelli P-Zero Directionale for the fronts and P-Zero Assymetrico for the rears. I think Goodyear F1 Fiorano is the only other tire that comes in 245/35-18.

I'm biased towards Bridgestones (i've driven on P700Z, RE-71, S-02 and now am running S-02 PP). My favourite has to be the S-02....compliant, grippy - wet and dry, cool looking.

For more choices of tires, you can go w/ 235/40-18 and 265/35-18 combo.

When doing track and/or autox, get r-compounds on separate rims (like the stock ones). Cheaper to wear those out than P-Zeros or S-03s. Also, unlike what Manny sez, R-compounds will smoke the stock max performance street tires....if they are pulling the same time, don't blame the tires, the driver isn't maxing out the r-compounds.

RotaryKnight

Yokohama AVS sport and the Toyo T1-S come in those sizes

Johnny

in 235x40 and 265x35 and 285x30...yes, but I could not find 245x35's in AVS sports...or I would have got them... I will probably try 255x35 and 285x30 for sure on my next set...I think that will be perfect for my 9 and 10 inch rim widths...

Toyo's I have no idea...maybe next time I get toyo's then

1FAST7

So Toyo don't make 245/35/18's?? im gonna check their site.

1FAST7

1FAST7

I just check Toyo's site at http://www.toyo.com and they had 235/40-18 and 265/35-18 and 245/35-18, but didnt have 285/30-18. The closet to 285/30-18 was 285/35-18. So what should I do? Should I get different than Toyo T1-S? thanks

1FAST7

Johnny

Personally I would not get 285x35x18...too tall..
245x35 are idea on 18's....that's a shame toyo does not make a 285x30...From what I have heard Ts-1's are good tires...

1bad7

would it be ok to go with yokohama AVS sports in 245/40/18 and 285/30/18. will this help keep acceleration loss to a minimum and also keep the speedo from screwing up? does the ecu calculate speed from the rear wheels?

SleepR1

The only two R-compound tires I've had that are worth the money are BFG G-Force R1-A and Hoosier R3S03. BFG G-Forces are no longer made, so that leaves Hoosier R3S03. Hoosiers are clearly head-and-shoulders above the R-compound tires most track enthusiasts use--Yoko A032R, Kumho V700, and Toyo RA-1. I've run on track with sports car drivers on R-compound tires (non-Hoosiers) while I had my P-Zero Asimmetricos (in stock size no less!), and have turned competitive laptimes with them. So perhaps the drivers aren't pushing their R-compound tires (non-Hoosiers). I'm keen on trying Pirelli P-Zero Cs (Competition version of their Asimmetric). I hear from the Porsche club racers that the P-Zero C provides consistently high perfomance and longer usable life (compared with Hoosier R3S03).

Johnny

I dont know..every tire size calc.. can differ somewhat...atleast it seems that way...when I calc stock 225x50x16 I get 811 rev...toyo list the 275x35x18 on a 9.5 rim as having 811 rev...that would match perfect.., but when I calc it I get 788 rev.. if you have taller ratio on the rear...you will be going faster then you think..pretty sure of that.

Johnny

I have BFG R1's on my stock rims...245x45...and yes when they are heated..they are pretty frecken sticky!...never tried Hoosiers..but I'm confident they are great.

1bad7

ok, but is the difference between 285/35 and 285/30 going to be that big? will it throw off the speedo by alot or just a little?

1FAST7

What would be the best size toyo T1-S tire to get for front and rear knowing that they dont make 285/30-18? This is for street use. And without rubbing the fenders at all.

1FAST7

JoeD

do not get 285/35 sized tires. the difference is too big as opposed to stock. 285/30s match the stock tires almost exactly in terms of diameter. stock tires diameter is 24.86 inches. 285/30's diameter = 24.73 inches (very close). 285/35's diameter is 25.85 imches. too big! the difference between stock and 285/35's is an entire inch in diameter. not only will that look really retarded, but it will hinder performance drastically, and throw your speedo off about 4 mph at 100 mph.

in tire diameter, if you cant match stock, it is always better to go a bit smaller. if you want to run a 35 series tire, go with 245/35 or 255/35. if you wanna run a 30 series tire, go with 275/30, 285/30, or 295/30.

(note: these tire diameters are from calculations, not actual manufacturer specs.)

Johnny

difference between these 2 is almost 5%...large to me...

285x35 is 4% larger then stock
285x30 is .5% smaller....

That's huge............ideally you want to get as close as possible but under 3% difference..

1FAST7

What is the Stock diameter for both front and rear? Are they both the same? what is the best diameter for front and for rear? Because toyo.com has diameters of each tire. Thanks

1FAST7

Johnny

going off www.toyo.com calcs for rev/mil I would choose
245x35x18 and 275x35x18..

rev for 245x35 is 839 little smaller than stock(calc 824, within 1%)
rev for 275x35 is 811.. near perfect to calculated stock of 811

So if I was dead set on toyo's I would go with these...let me know how much they cost and how they work..cause this might be mu next set also

1FAST7

thanks, I'll look more into the sizes you gave me and then make my decision.

1FAST7

1FAST7

btw, what is the stock REV for the front and rear?

1FAST7